John e



(No Model.)

J. E. WOOTTEN.

LOOOMOTIVE BOILER. No. 354,870. Patented Dec. 14,1886.

WITNESSES: VENTOR,

UNITE STATES PATENT OFFICE.

JOHN E. WOOTTEN, OF PHILADELPHIA, PENNSYLVANIA, ASSlG-NOR TO THE VHARTON RAILROAD SWITCH COMPANY, OF SAME PLACE.

LQCOMOTtVE-BOI LE R.

SlPBCIPICATION forming part of Letters Patent No. 354,370, dated December 14, 1886.

Application filed Octobcr21,1886. Serial No. 216,853. (No model.)

To aZZ whom it may concern.-

Be it known that I, JOHN E.-Woo'rTEN, of the city and county of Philadelphia, in the State of Pennsylvania,'have invented a certain new and useful Improvement in Locomotive- Boilers, of which improvement the following is a specification.

The object of my invention is to enable the maximum. practicable area of grate and fireboX heating surface to be made available in a locomotive-boiler without either unduly elevating the waist or cylindrical portion of the boiler or involving the employment of a combustion-chamber and fire-bridge, as heretofore ordinarily embodied in the application of boilers of the wide fire-box type to practical service.

To this end my invention, generally stated, consists in' a locomotive-boiler having a firebox which is extended laterally beyond and located substantially entirely above the lower line of the waist, so as to present as large an area of grate and heating surface as desired, and admit of being extended over the drivingwheels of the engine, and a waist or cylindrical shellhaving a series of tubes extending from the fire-box flueshcet to the smoke-box, the lowermost row of said tubes being located at such distance above the grate as to provide a blank or unperforated area at the lower portion of the flue-sheet sufficient to serve as the forward boundary of the bed of fuel on the grate.

The improvement claimed is hereinafter fully set forth.

In the accompanying drawings, Figure 1 is avertical longitudinal central section through a locomotive-boiler embodying my invention, and Fig.2 avertical transverse section through the same at the line as x of Fig. 1.

In the practice of my invention a cylindrical waist or shell, 1, is riveted at its forward end to a smoke-box, 3, and similarly connected at its rear end to a fire-box, 4:, which is extended laterally beyond the waist and the planes of the driving-wheels of the engine as far as desired within the limit admissible for passage over the road, and is located entirely above the lower line of the Waist, its bottom being in a plane slightly above or closely adjacent to said line, so that, as in previous constructions of the wide fire-box type, the driving-wheels may be placed beneath it without undue or inconvenient elevation of the boiler above the rails. The fire-box is provided with a'suitable grate, 6, extending from its flue-sheet 5 to its rear water-space, and which is preferably, as shown, composed of alternate water-tubes and bars, although any other ap proved form may be employed in the discretion of the constructor.

A series of fire-tubes, 2, extends from the fluesheet 5 to the smoke-box, and the lower most tier or row of said tubes, instead of being placed, as in the ordinary constructions, as near as practicable to the lower line of the shell, is located at such distance above the line of the top of the grate as to cause a blank or unperforated area to be presented at the lower portion of the flue-sheet 5 of sufficient height to serve as the forward boundary of the bed of fuel placed upon the grate, and to admit of the same being supported thereon entirely below the lowest row of tubes. By such construction I am enabled to dispense with a combustion-chamber in the rear portion of the waist having a fire-bridge at its end next the fire-box, which has heretofore been usually employed in boilers of this type, and by which, among other things, a function similar to the result here effected by the blank or unperforated lower area of the flue-sheet 5 was performed. In addition to the structural economy thus attained, the fines 2 are of correspondingly greater length, being extended through that portion of the waist in which the combustion-chamber has heretofore been 10- catcd.

The employment of a laterally-extended firebox, which, by the abundant grate-area that it presents, enables a comparatively light and shallow fire to be carried upon the grate, and combustion to be maintained under so easy an exhaust-blast that the tendency to the projection of particles of fuel into the tubes is materially reduced, renders practicable the use of a blank area of flue-sheet which is so small comparatively that the number of fines omitted from the lower portion of the waist to provide it is not found tomaterially deteriorate from the steam-generating capacity of the boiler, and the provision of such blank area of fluesheets affords the capacity of utilizing an enlarged fire-box Without the necessity of the fire-tubes leading from the fine-sheet through provision of special adjuncts for separating .the waist, the lowermost row of said tubes bethe forward portion 0f the bed of fuel from the ing located at such distance above the ordi- 1 openings of the lower tubes, as has heretofore nary grate-level of the fire-box as to provide 5 been the case. I a blank or unperforated area at the lower por- I claim as my invention and desire to secure tion of the flue-sheet sufficient to serve as the by Letters Patentforward boundary of the bed of fuel on the The combination, in a locomotive-boiler, of grate, substantially as set forth. a waist or shell, a fire-box extended laterally JOHN E. WOOTTEN. [0 beyond the waist and located in such horizon- W'itnesses:

tal relation thereto as to admit of driving- -L. B. PAXSON,

wheels being placed beneath it, and a series of JAs. M. LANDIS. W 

